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Cell[CellGroupData[{
Cell[TextData[{
  "Image manipulation with ",
  StyleBox["Mathematica",
    FontSlant->"Italic"],
  " "
}], "Subtitle"],

Cell[TextData[{
  "To do image manipulation, the first thing you need is to import the image. \
 Fortunately, ",
  StyleBox["Mathematica",
    FontSlant->"Italic"],
  " 4  includes a powerful ",
  StyleBox["Import", "Input"],
  " command that is able to handle a wide range of image formats \
automatically.  In general, you just give it the name of the file you want to \
import and it figures out the format automatically.  For example, the \
following command imports a JPEG image of a very cute puppy (assuming of \
course that you have a file with this name):"
}], "Text"],

Cell[CellGroupData[{

Cell[BoxData[
    \(SetDirectory["\<C:\My Documents\IMS\Numerics Tutorial\Image \
Manipulation\>"]\)], "Input"],

Cell[BoxData[
    \("C:\\My Documents\\IMS\\Numerics Tutorial\\Image Manipulation"\)], \
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Cell[BoxData[
    \(\(puppyImage = Import["\<Lilypup.JPG\>"];\)\)], "Input"],

Cell[BoxData[
    \(\(Show[puppyImage];\)\)], "Input"],

Cell["\<\
The basic part of the image is just imported as numeric data.  Without going \
into details, I can define\
\>", "Text"],

Cell[BoxData[
    \(\(ImageData[image_]\  := \ image[\([1, 1]\)];\)\)], "Input"],

Cell["Then, ", "Text"],

Cell[BoxData[
    \(Dimensions[ImageData[puppyImage]]\)], "Input"],

Cell["\<\
tells me the image has data for three colors at 484x445 (= 215380) points.  \
\
\>", "Text"],

Cell[BoxData[
    \(Part[ImageData[puppyImage], 1, 1]\)], "Input"],

Cell["\<\
Shows what the data looks like for a single point.  In fact, the data \
consists of integers between 0 and 255.\
\>", "Text"],

Cell["\<\
The first thing I will show you how to do is quite basic, but will be useful \
for the examples I show you, it is selecting a subimage to view or \
manipulate.  As is typical for tasks that I might do repeatedly, I will \
define a function to do it.\
\>", "Text"],

Cell[BoxData[
    \(ImagePart[image_, xp_, \ 
        yp_]\  := \ \[IndentingNewLine]Module[{newimage\  = \ 
            image}, \[IndentingNewLine]newimage[\([1, 1]\)]\  = \ 
          Take[ImageData[newimage], yp, xp]; \[IndentingNewLine]Show[
          newimage]]\)], "Input"],

Cell[BoxData[
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Cell[BoxData[
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Cell[BoxData[
    \(\(lefteye\  = \ ImagePart[pup, {92, 110}, {89, 107}];\)\)], "Input"],

Cell[TextData[{
  "Since the data is represented in ",
  StyleBox["Mathematica",
    FontSlant->"Italic"],
  " as lists of numbers, you can use any ",
  StyleBox["Mathematica",
    FontSlant->"Italic"],
  " command which is appropriate for such."
}], "Text"],

Cell[BoxData[
    \(\(Block[{newimage\  = \ 
            pup}, \[IndentingNewLine]newimage[\([1, 1]\)]\  = \ 
          Transpose[ImageData[pup]]; \[IndentingNewLine]Show[
          newimage]];\)\)], "Input"],

Cell["\<\
In fact, once you realize that an image is just a particular way of viewing a \
(particular type) of dataset, the possibilities become endless for \
manipulating the image.  In todays presentation, I will demonstrate a few of \
the possibilities:\
\>", "Text"],

Cell[TextData[{
  "When the colors are combined to produce a ",
  ButtonBox["grayscale image",
    ButtonData:>{"Grayscale.nb", None},
    ButtonStyle->"Hyperlink"],
  ", the data becomes a simple matrix and it is easy to work with."
}], "Text"],

Cell[TextData[{
  "One thing you can do in ",
  StyleBox["Mathematica",
    FontSlant->"Italic"],
  " that standard image processing programs cannot is work with a ",
  ButtonBox["continuous",
    ButtonData:>{"Continuous.nb", None},
    ButtonStyle->"Hyperlink"],
  " function representation."
}], "Text"],

Cell[TextData[{
  "The idea of ",
  ButtonBox["mapping",
    ButtonData:>{"Maps.nb", None},
    ButtonStyle->"Hyperlink"],
  " the image leads to some interesting ways of visualizing numerical data."
}], "Text"]
}, Open  ]]
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Cached data follows.  If you edit this Notebook file directly, not using
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